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Radda [10]
3 years ago
11

Filling up a balloon with hot air. Physical or chemical

Chemistry
2 answers:
fredd [130]3 years ago
6 0

Answer:

Physical.

Explanation:

Nothing changes in a chemical state just adding hot air to a balloon.

Zielflug [23.3K]3 years ago
4 0

I'm pretty sure this is classified as a chemical change.

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The acceleration due to gravity on Earth is 9.80 m/s 2 . If the mass of a honeybee is 0.000100 kilograms, what is the weight of
sweet [91]
Okay so i think the answer to this is.

weight=mg

m=0.000100 g=9.80

so weight= 0.00980 kgm/s2
Hopefully thats correct (i am horrible at math) 
5 0
3 years ago
A piece of iron has a volume of 11.6 cm3 and a mass of 63.5g what is its density?
SashulF [63]
D=m/v d=63.5g/11.6cm3=5.47g/cm3
8 0
3 years ago
A chemist wants to calculate the amount of heat that is absorbed by a sample of copper as it is melted. Which constant should sh
34kurt

The constant used for the absorption of heat by the sample in melting is +\Delta H_{fus}.  Thus, option A is correct.

The chemical reaction has been defined as the energy in which the energy has been released or absorbed for the breaking of bonds in the reactants and the formation of product.

<h3>Constant for energy absorbed</h3>

The energy has been absorbed in the melting of the copper sample. Thus, the sample has been converted from the solid to the liquid state.

The change in energy with the conversion in solid and liquid state has been termed as heat of fusion.

The energy has been absorbed by the system, thus it has been marked with the positive sign.

Therefore, +\Delta H_{fus} has been the constant used for the absorption of heat by the sample in melting. Thus, option A is correct.

Learn more about melting sample, here:

brainly.com/question/8828503

8 0
3 years ago
Tìm câu sai về độ pH?
galina1969 [7]

Answer:

B

Mark as the Brainliest please

5 0
2 years ago
Pick one option:
Dmitry [639]

Answer:

Li⁺

Explanation:

Li⁺ ions has a noble gas electron configuration because it resembles that of He.

To have a noble configuration, electrons in the outermost shell must completely fill their respective orbitals.

Li⁺ is an ion that has lost one electron from the usual number of 3 thereby remaining 2 electrons.

 The electronic configuration is given as;

         Li⁺       1s²

The S orbital can hold a maximum number of just two electrons.

     Helium atom has two electrons with electronic configuration of  1s²

Therefore      Li⁺   =    1s²    =    He

4 0
3 years ago
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